Furnace.



No. 653,592; Patented My ID, I900.

' T. E. PUDDINGTON.

FURNACE.

(Apglication filed Nov. 17, 1898.)

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T. E. Punpmamu.

FURNACE. (A nm'idn filed Nov. 17, 1998.

(No Model.)

No. 653,592. Patented July I0, I900,

T. E. PUDDINGTON.

FURNACE (Application filed Nov 1.7, 1898.) (N0 Mo -X. 3 Shoots-Shoat 3,

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UNITED STATES- PATENT OFFICE.

THOMAS E. PUDDINGTON, OF SOMERVILLE, MASSACHUSETTS.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 653,592, dated July 10, 1900.

Application filed November 17, 1898. Serial No. 696,703. No model-J To all whom it may concern.-

Be it known that LTHOMAS E. PUDDINGTON, of Somerville, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Furnaces, of which the following is a specification.

Thisinvention has relation to boiler and other furnaces, and has for its object to provide improved means for assisting the com bustion of the ordinary fuel on the grate.

In carrying my invention into effect I propose to provide the walls of the furnace with a suitable conduit or retort and supply thereto from a suitable source a mixture of oil and steam. The oil and steam carriedthrough the conduit becomes heated by reason of its proximity to the fire and issues as a combustible gas through a series of nozzles or apertures above the grate. This vapor combines with the gases rising from the coal or other ordinary fuel, and the two burn together with a very hot flame.

My invention will be more readily understood from the succeeding description and claims, taken in connection with the accompanying drawings, in which- Figure 1 represents a longitudinal sectional view of a furnace provided With my improved burner. Fig. 2 represents a transverse sectional view of said furnace. Fig. 3 represents a horizontal sectional view. Fig. 4 represents an enlarged vertical sectional view of the bridge-wall. Fig. 5 represents an enlarged horizontal sectional view of one corner of the furnace. Fig. 6 represents aview corresponding to Fig. 1, showing a modification. Fig. 7 represents an enlarged detail sectional view of a part of said modification.

The same reference characters indicate the same parts in all the figures.

In the drawings a portion of a water-tube boiler of well-known type is represented in connection with the furnace; but it will be well understood that the form of the boiler is not material to my invention.

Referring for the present to Figs. 1 to 5, inclusive, 0. a" a represent the bridge-wall and side walls of the furnace inclosing the fire-chamber, 1) represents the grate, and 0 represents a portion of a boiler located above the fire-chamber. Said walls are built with an internal chamber or cavity, in which a coil of pipe 6 is placed, the said pipe extending in continuous convolutions on the three sides of the furnace from an inlet-pipe e at its lowest point on one side of the furnace to a blind termination e at its highest point on the other side of the furnace. I Supports for this pipe are provided, comprising upright plates f f upon the inner sides of the pipes and bolt-rods f f, attached to these plates and extending through to the outside of the furnace-walls, where they are anchored, by means of blocks f f, on the sloping rear side of the bridge-wall a and plates f f on the side walls a, and .when the pipe is in place the space surrounding it is filled in solid with broken brick and cement or other similar material a so as to avoid the formation of an air-space Which would prevent the proper conduction of heat to the pipe. Opposite the uppermost length of pipe in the coil 6 the walls are formed with a series of transverse apertures of a connecting the cavity a containing the pipe with the fire-chamber, each aperture being fitted with a metallic'sleeve or bush 6 which terminates a little short of the inner face of the wall. Aseries of small pipes or nozzles e are fitted into the top pipe in the coil 6 and project part way through the sleeves e This construction prevents the ends of the nozzles from being destroyed by the action of the fire. It is not necessary to make holes in the bricks for the insertion of the sleeves, as the bricks may be set so as to leave sufiicient space for the sleeves and then the spaces be filled in with cement or other material around the sleeves. The sleeves surround the gas-nozzles closely and effectually protect them from the flames and heat of the furnace. These outlets or jets from the coil or retort c are so located on the three sides of the furnace as to cause the contents ofthe retort to intcrmix freely with the gases arising from the bed of fuel on the grate b, said gases being as yet in an incomplete state of combustion. A continuous supply of the mingled steam and oil is kept up through the inlet-pipe c by means of suitable apparatus connected therewith; but as such apparatus forms no part of my present invention I have not illustrated the same. The mingling of the gas formed by the decomposition of the oil and steam with the gases from the grate fuel efiects a much more complete combustion and secures a hotter flame than is secured when the ordinary fuel is used alone.

It is important that there shall be a very complete conversion of the oil and steam introduced into the conduit or retort into gas before its discharge into the fire-chamber,

- and to this end Iarrange the conduit, as described, in continuous convolutions on the side and end of the fire-chamber and multiply its convolutions in a vertical tier. Thus as the steam and oil pass from one end to the other of this greatly-elongated retort, every coil of which is subjected to a high degree of heat, their thorough conversion into inflammable gas is assured. This gas issuing from the nozzles e is immediately ignited upon reaching the firechamber by the flames therein, and the jets of flameissuing from the furnace-walls on three sides have the efiect of intermixing, agitating, and stirring up the products of combustion from the fuel-bed on the grate and igniting such portions as were previously unconsumed by reason of insufficient heat. The bank of jets in the bridgewall I regard as the most important of all, inasmuch as the flames issuing therefrom beat back the products of combustion from the grate-fuel which would tend to rush over the bridge-wall partially unconsumed, stirring up and intermixing with them and raising them to the temperature of ignition with the assistance of the side jets before they leave the fire-chamber.

In Figs. 6 and 7 I have shown another embodiment of my invention, in which the pipeeoi'l is dispensed with and in its place is employed aretort g, composed of fire-brick. The retort is shown in sections or bricks g g, incorporated in the furnace-walls on three sides of the fire-chamber, on the inside of said walls, said bricks having interlocking projections or sutures g g at their ends. The several bricks are composed of crucible-clay to resist the fire, and each is longitudinally apertured or provided with ducts on the inside, the walls of which ducts are preferably glazed to retain the liquid or vapor. The ducts collectively form a conduit having continuous convolutions, as in the case of the pipe-coil. The mingled oil and steam is introduced through an inlet-pipe 9' into the lowest part of the retort g, and in its progress from the said lowest point to the upper portion of the retort becomes converted into gas by the action of the fire and issues into the fire-chamber through a series of jets or apertures 9, leading from the top length or convolution of the duct. At the junction of the inlet-pipe g with the duct g is a nipple or sleeve 9 of fire-clay, surrounding the said inlet-pipe g.

I claim- 1. A furnace comprising a grate, side and bridge Walls, a conduit or retort incorporated in said walls and extending in a series of continuous convolutions one above another along said side and bridge walls, whereby a mixture of oil and steam forced through said conduit becomes heated in each convolution and thoroughly converted into gas in its passage through said convolutions, and a series of outlets leading from the upper portion of said conduit through the side and bridge walls into the fire-chamber above the grate, whereby the ignited gas, issuing in jets of flame from the side and end of the furnace into the fire-chamber, becomes thoroughly intermixed with the unconsumed products of combustion of the fuel on the grate before they escape over the bridge-wall, and completes their combustion.

2. Afurnace having a grate and walls,a pipe embedded. longitudinally in said walls and constituting a retort, a series of separate and independent sleeves set or embedded transversely in said walls and terminating short of the inner surfaces thereof, and a series of nozzles fixed in the pipe and projecting into the sleeves, said nozzles being closely surrounded by the sleeves and protected thereby from the heat and flames of the furnace, substantially as described.

In testimony whereof I have aflixed my sig nature in presence of two witnesses.

THOMAS E. PUDDINGTON.

\Vitnesses:

RoBT. W. HAWTHORNE, HORACE CRAIGHEAD. 

